Math of FF sensor size vs crop can someone help explain

Started Nov 25, 2012 | Discussions thread
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Math of FF sensor size vs crop can someone help explain

Ok, been pondering about this for a while and question how is the crop factor of FF calculated?

FF is 24mm x 36mm = 864mm2

Crop Canon 22mm x 14.8mm = 329mm2

micor 4/3 or 4/3 17.3mm x 13mm = 225mm2

so given that how is the 1.6 crop factor calculated when the sensor is 2.63 times smaller?

and for 4/3 its even 3.84 times smaller?

How do you get a crop factor for the lenses of 2 if the sensor is a fourth of the size for the 4/3 system?

My assumption was always well 4/3 is "only" half the size of FF sensor? But NOT true.

So how does the saying go? "Assumption is the mother of all Fups"

Thanks for explaining.

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